EP1531609A1 - Apparatus and method for reproducing three dimensional stereo sound for communication terminal - Google Patents

Apparatus and method for reproducing three dimensional stereo sound for communication terminal Download PDF

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Publication number
EP1531609A1
EP1531609A1 EP04027299A EP04027299A EP1531609A1 EP 1531609 A1 EP1531609 A1 EP 1531609A1 EP 04027299 A EP04027299 A EP 04027299A EP 04027299 A EP04027299 A EP 04027299A EP 1531609 A1 EP1531609 A1 EP 1531609A1
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EP
European Patent Office
Prior art keywords
sound
sound data
data
dimensional stereo
format
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04027299A
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German (de)
English (en)
French (fr)
Inventor
Sang-Ki Kang
Jae-Hyun Kim
Yong-Serk Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP1531609A1 publication Critical patent/EP1531609A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • H04M1/72442—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality for playing music files

Definitions

  • the present invention relates to a mobile communication terminal. More particularly, the present invention relates to an apparatus and a method for enabling sound data having a three dimensional stereo sound effect to be reproduced in a mobile communication terminal.
  • a portable phone such as a cellular phone and a PCS (Personal Communication Services) phone, which is a typical communication terminal, emits a sound or an alert sound to the exterior through a speaker so that a user can recognize a call incoming while using the portable phone.
  • PCS Personal Communication Services
  • the Yamaha sound chips are classified into 4 poly, 16 poly, 40 poly, and 64 poly.
  • the term "poly" is used to distinguish the sound chips according to the number of chords that can be reproduced. In general, sounds of various musical instruments as many as the relevant number of 'poly' can be simultaneously represented. Therefore, as the number of 'poly' increases, higher fidelity sounds can be represented.
  • stereo sound means a sound signal to which spatial information is added so that a listener can perceive direction and distance of a sound upon hearing it.
  • the three dimensional stereo sound effect has been applied also to the mobile communication field resulting in an increased demand for sound recording and reproducing techniques to provide more enhanced reality provided by added spatial information and moving information, so that it is necessary to authentically reproduce the three dimensional stereo sound.
  • a typical stereo sound reproduction is mainly provided by a multi-channel, for instance, 5.1 channel, in motion picture movie, TV, audio, and home theater fields.
  • a portable phone or a personal digital assistant (PDA) phone capable of providing the three dimensional stereo sound effect.
  • a proposed method is to store sound data including information about the three dimensional stereo sound effect in a memory in advance and to reproduce the stored three dimensional stereo sound effect together with the sound data, which provides the three dimensional stereo sound effect to a user using a terminal equipped with two or more speakers.
  • FIG. 1 is a block diagram illustrating a sound signal reproducing apparatus of a typical mobile communication terminal.
  • a controller 10 performs an entire control operation for the mobile communication terminal.
  • a radio frequency (RF) signal processing unit 12 down-converts signals in a frequency band, which is received through an antenna by a radio channel of a predetermined frequency band from a network, and transmits the received signals to the controller 10 or a voice codec unit 14 according to the kinds of data, under the control of the controller 10.
  • RF radio frequency
  • Data transmitted from the RF signal processing unit 12 to the controller 10 includes data received through a traffic channel, a paging signal received through a control channel, a signaling signal, and the like.
  • Data transmitted from the RF signal processing unit 12 to the voice codec unit 14 include voice data received when a voice call has been established. Also, the RF signal processing unit 12 up-converts data received from the controller 10 and coded voice data received from the voice codec unit 14 to radio signals of a predetermined frequency band and transmits the radio signals to the network through the antenna.
  • the voice codec unit 14 generally includes a vocoder and operates under the control of the controller 10.
  • the voice codec unit 14 codes an electrical voice signal received from a microphone 16 and transmits the coded voice signal to the RF signal processing unit 12. Also, the voice codec unit 14 decodes coded voice data, which are received from the RF signal processing unit 12, to convert the coded voice data into an electrical voice signal, and then outputs the electrical voice signal to a speaker 20.
  • the speaker 20 converts the received electrical voice signal into an audible sound and outputs the audible sound.
  • a display unit 24 includes a display device, such as a liquid crystal display (LCD), for displaying proceeding states with letters and/or icons, a vibration motor, and an alert lamp.
  • the liquid crystal display of the display unit 24 displays a current state of the mobile communication terminal. Also, the liquid crystal display converts data input, when a user performs a key input, into letters, icons, or characters, and displays the letters, icons, or characters.
  • LCD liquid crystal display
  • a keypad input unit 26 generally has a key matrix structure and includes number keys for dialing, function keys for performing various functions, a selection key, direction keys for movement in the up, down, light, left directions.
  • the keypad input unit 26 generates key data corresponding to a key operated by a user and outputs the generated key data to the controller 10.
  • a memory unit 22 may include a ROM (Read Only Memory) and a RAM (Random Access Memory), and is classified into a region for storing program codes required to control the controller 10, a region for storing data input by a user, and a region for temporarily storing data generated during a controlling operation.
  • the memory unit 22 includes sound data which can be used to notify a user of the reception of a call incoming or to generate an alert sound.
  • the sound data may be stored by a manufacturer in advance or may be downloaded from a provider server (carrier server) 28 which can be connected to the mobile communication terminal through wireless, a USB (Universal Serial Bus) port, an IEEE 1394 port, an infrared port, or the like.
  • the sound data are stored in a synthetic music mobile application format ('SMAF'), which has an extension of '.mmf' when being stored as a file, so as to be processed by a Hyundai sound chip 18.
  • 'SMAF' synthetic music mobile application format
  • the Yamaha sound source chip 18 converts the sound data, which is read from the memory unit 22 by the controller 10, into an electrical signal, and outputs the converted electrical signal to the speaker 20.
  • the speaker 20 includes two or more speaker devices so as to support the three dimensional stereo sound effect.
  • the conventional mobile communication terminal reproduces sound data such as a melody sound and the like using the Yamaha sound chip 18. Therefore, the memory unit 22 must store three dimensional sound data in the SMAF. Also, the provider server 28 does not process sound data in real time, but converts three dimensional sound effect obtained through a three dimensional reproducing algorithm into the SMAF and then downloads the converted data to the memory unit 22.
  • the Yamaha sound chip does not completely support the three dimensional stereo sound effect and approximately estimates original sound data by means of a synthetic sound table and tones which the chip has, an error is generated, so the conventional devices are limited in correctly reproducing the original sound data.
  • the Yamaha sound chip causes distortion of a specific sound when simultaneously reproducing voice and music sounds, first sound data including only voices and second sound data including only melodies must be separately stored when melody sounds are made up, thereby requiring a large storage capacity.
  • an object of the present invention is to provide an apparatus and a method for reproducing sound having a three dimensional stereo sound effect in a mobile communication terminal.
  • Another object of the present invention is to provide an apparatus and a method for storing sound data having a three dimensional stereo sound effect in a device with a minimum size in a mobile communication terminal.
  • Still another object of the present invention is to provide an apparatus and a method for storing sound data having a three dimensional stereo sound effect in an MP3 format or an AAC format and for reproducing the stored sound data.
  • a three dimensional stereo sound reproducing apparatus for a mobile communication terminal, the three dimensional stereo sound reproducing apparatus comprises a memory for storing sound data having a three dimensional stereo sound effect; a sound processing unit for reading the sound data from the memory when an incoming call is generated or when a user requests reproduction of the sound data and for decoding the sound data without distortion of the three dimensional stereo sound effect, thereby outputting the sound data as a type of an analog signal; and a speaker for amplifying the analog signal and outputting the amplified analog signal as a type of an audible sound.
  • a method for reproducing sound data having a three dimensional stereo sound effect in a communication terminal comprises the steps of storing the sound data having the three dimensional stereo sound effect in a memory of the communication terminal; reading the sound data from the memory when an incoming call is generated or when a user requests reproduction of the sound data and decoding the sound data without distortion of the three dimensional stereo sound effect; and converting the decoded data into an analog signal and outputting the analog signal as a type of an audible sound.
  • the present invention is proposed to store and reproduce sound data having a three dimensional stereo sound effect using Motion Picture Experts Group-1 Audio layer 3: MPEG-1 layer 3 (MP3) or MPEG-2 Advanced Audio Coding (MPEG-2 AAC, hereinafter referred to 'ACC') in a mobile communication terminal.
  • MP3 Motion Picture Experts Group-1 Audio layer 3
  • MPEG-2 AAC MPEG-2 Advanced Audio Coding
  • a communication terminal such as a portable phone or a PDA phone, in which an MP3 decoder or an AAC decoder is included, generates sound data in an MP3 format or an AAC format, stores the generated sound data in a communication terminal, and reproduces the stored sound data using the MP3 decoder or the AAC decoder so as to improve the performance and the memory efficiency of the communication terminal when a three dimensional stereo sound is reproduced.
  • FIG. 2 is a block diagram illustrating a sound signal reproducing apparatus of a mobile communication terminal according to a preferred embodiment of the present invention.
  • a controller 30 includes a modem chip for performing an entire control operation for the mobile communication terminal.
  • An RF (Radio Frequency) signal processing unit 32 down-converts bands of frequency which is received through an antenna by a radio channel of a predetermined frequency band from a network, and transmits the received signal to the controller 30 or a voice codec unit 34 according to the kinds of data, under the control of the controller 30.
  • RF Radio Frequency
  • Data transmitted from the RF signal processing unit 32 to the controller 30 include data received through a traffic channel, a paging signal received through a control channel, a signaling signal, and the like.
  • Data transmitted from the RF signal processing unit 32 to the voice codec unit 34 include voice data received when a voice call has been established. Also, the RF signal processing unit 32 up-converts data received from the controller 30 and coded voice data received from the voice codec unit 34 to radio signals of a predetermined frequency band and transmits the radio signals to the network through the antenna.
  • the voice codec unit 34 generally includes a vocoder and operates according to the control of the controller 30.
  • the voice codec unit 34 codes an electrical voice signal received from a microphone 36 and transmits the coded voice signal to the RF signal processing unit 32.
  • the voice codec unit 34 decodes coded voice data, which are received from the RF signal processing unit 32 through the controller 30, to convert the coded voice data into an electrical voice signal, and then outputs the electrical voice signal to a speaker 48.
  • the speaker 48 converts the received electrical voice signal into an audible sound and outputs the audible sound.
  • a display unit 58 includes a displayer, such as a liquid crystal display (LCD), for displaying proceeding states with letters and/or icons, a vibration motor, and an alert lamp.
  • the liquid crystal display of the display unit 58 displays a current state of the mobile communication terminal. Also, the liquid crystal display converts data inputted, into letters, icons, or characters, and displays the letters, icons, or characters.
  • a keypad input unit 60 generally has a key matrix structure and includes number keys for dialing, keys for inputting text, function keys for performing various functions, a selection key, direction keys for movement in the up, down, light, left directions.
  • the keypad input unit 60 generates key data corresponding to a key operated by a user and outputs the generated key data to the controller 30.
  • a memory unit 50 may include a Read Only Memory (ROM) and a Random Access Memory (RAM), and is classified into a region for storing program codes required to control the controller 30, a region for storing data input by a user, and a region for temporarily storing data generated during a controlling operation.
  • the memory unit 50 includes sound data 52, 54, and 56, which can be used to notify a user of the reception of a call incoming or to generate an alert (alarm) sound.
  • the sound data 52, 54, and 56 may be stored by a manufacturer in advance or may be downloaded from a provider server (carrier server) 62 which can be connected to the mobile communication terminal through wireless, a Universal Serial Bus (USB) port, an IEEE 1394 port, an infrared port, or the like. Also, a user can connect the mobile communication terminal to a personal computer through wireless, a USB port, an IEEE 1394 port, or an infrared port, and then download and store the sound data 52, 54, and 56 in the memory unit 50 using the connected personal computer.
  • a provider server carrier server
  • the sound data includes a three dimensional stereo sound effect so as to be processed by a sound processing unit 38 and is compressed in the MP3 format or the AAC format.
  • the sound processing unit 38 converts the sound data 52, 54, and 56, which is read from the memory unit 50 by the controller 30, into an electrical signal, and outputs the electrical signal to the speaker 48.
  • the speaker 48 includes two or more speaker devices so as to support the three dimensional stereo sound effect.
  • the speaker 48 is a stereo speaker which amplifies an analog stereo signal output through a stereo digital-to-analog converter 46 and outputs the analog stereo signal as an audible sound.
  • the sound processing unit 38 includes the stereo digital-to-analog converter 46 and at least one of an MP3 decoder 42 and an AAC decoder 44.
  • FIG. 2 shows a structure in which both the MP3 decoder 42 and the AAC decoder 44 are included and one of the two decoders is selected by a switch 40.
  • the memory unit 50 stores two dimensional melody sound data 52, three dimensional sound data 54 of an MP3 format, and three dimensional sound data 56 of an AAC format.
  • the controller 30 reads a relevant sound data from the memory unit 50 and provides the read data to the sound processing unit 38.
  • the switch 40 When the three dimensional sound data 54 of the MP3 format is read by the controller 30, the switch 40 is switched under the control of the controller 30 to send the three dimensional sound data 54 of the MP3 format to the MP3 decoder 42.
  • the three dimensional sound data 54 is decoded according to an MP3 scheme by the MP3 decoder 42, is converted into an electrical signal by the stereo digital-to-analog converter 46, and then is output through the speaker 48.
  • the switch 40 When the three dimensional sound data 56 in the AAC format is read by the controller 30, the switch 40 is switched under the control of the controller 30 to send the three dimensional sound data 56 of the AAC format to the AAC decoder 44.
  • the three dimensional sound data 56 is decoded according to an AAC scheme by the ACC decoder 44, is converted into an electrical signal by the stereo digital-to-analog converter 46, and then is output through the speaker 48.
  • the melody sound data 52 can be reproduced by any one of the MP3 decoder 42 and the ACC decoder 44.
  • the MP3 can compress digital audio data into a size approximately twelve times smaller than that of digital audio data stored in a general audio compact disc (CD) while maintaining the quality of the digital audio sound.
  • the MP3 sound data having a size ten times smaller than that of a general digital audio data can ensure the quality of sound (16 bits and 44.1 kHz) as good as a CD.
  • the AAC compression scheme is not derived from either MPEG-1 or MPEG-2, but is called 'MP4', which means a more developed technique than MP3.
  • the MPEG-2 used for a digital versatile disc (DVD) video has a superior sound quality than and a higher compression ratio than those of MPEG-1, thereby having excellent performance including a screen quality four times as good as that of the MPEG-1 and the support of multiple languages.
  • the AAC deriving from such MPEG-2 can compress a general digital audio data by a twentieth (1/20) and is a digital file compression method capable of preventing the data from being illegally copied.
  • the data structure of the MP3 is fixed while the data structure of the AAC is variable. That is, MP3 causes data to be stored according to frames following a header, which contains information about the whole of a tune. Since the frame has a fixed size, the frame may include an unoccupied capacity which is unnecessary even in a portion having a high compression ratio. In contrast, since the frame of the AAC has a variable structure to change the size of the frame according to compression ratios, the capacity of the entire data is significantly reduced. Actually, the AAC can reduce its data capacity by maximum 30 % as compared with that of the MP3.
  • the second advantage of the AAC is the good quality of the sound. Unlike the MP3, the AAC maintains the quality of the original sound by two techniques, that is, a temporal noise shaping (TNS) and a prediction.
  • TNS is a quantization compensation technique, which reduces noise and generates a sound similar to an original sound by perceptually decreasing error caused when a continuous analog music signal is changed into digital data of 'ones' and 'zeroes'.
  • the prediction includes storing a value compensated by the TNS. That is, the prediction is to storing information about values compensated in previous portions and to use the memorized information when the same data is generated in following portions. If two same sounds are compensated to different values in a quantization step, the two same sounds are output as two different sounds. Therefore, the prediction is performed so that the same sounds can be compensated to the same value and reproduced as the same sound.
  • the MP3 and the AAC do not change original sound data to those approximate values, but compress the original sound data by a perceptual coding method at a level in which the characteristics of an audio signal cannot be perceptually recognized, thereby preventing a three dimensional stereo sound effect included in the original sound data from being distorted.
  • a provider server 62 for providing a service for the three dimensional sound data 54 and 56 and the mobile communication terminal there are advantages in that a download time is shortened and memory use becomes twice as efficient as compared to that of a conventional SMAF.
  • FIG. 3 is a flowchart illustrating a sound signal reproducing operation in a mobile communication terminal according to an embodiment of the present invention.
  • step 70 three dimensional sound data of the MP3 format or the AAC format is stored in the memory unit 50 of the mobile communication terminal from a manufacturer, a user of the mobile communication terminal, or a provider server through wireless, a USB port, an IEEE 1394 port, or an infrared port.
  • step 72 the user selects and determines a three dimensional melody sound corresponding to the three dimensional sound data as an incoming melody sound.
  • the controller 30 When a call is incoming or when the reproduction of the melody sound is required by the user in step 74, the controller 30 reads the three dimensional melody sound determined as the incoming melody sound or relevant three dimensional sound data required by the user from the memory, and controls the switch 40 to be switched to a decoder 42 or 44 corresponding to the format of the read three dimensional sound data (step 76).
  • step 78 the decoder 42 or 44 connected with the switch 40 receives the read three dimensional sound data through the switch 40 and decodes the received data according to an MP3 scheme or an AAC scheme, respectively.
  • step 80 the decoded signal is converted into an analog audio signal by the stereo digital-to-analog converter 46 and then is outputted through the speaker 48.
  • the three dimensional stereo sound data can be reproduced while the quality of an original sound is maintained at a satisfactory level by using data constructed with the AAC format or the MP3 format, so that it is possible to obtain an excellent three dimensional stereo sound effect and excellent performance in reproducing the original sound.
  • the size of sound data is reduced by half, the capacity and the manufacturing cost for a data storing memory can be significantly reduced while an excellent perceptual quality of sound is ensured without any distortion. Also, since the period of time required to download sound data is reduced by half, a user's download fee be can decreased.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Function (AREA)
  • Stereophonic System (AREA)
  • Mobile Radio Communication Systems (AREA)
EP04027299A 2003-11-17 2004-11-17 Apparatus and method for reproducing three dimensional stereo sound for communication terminal Withdrawn EP1531609A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020030081269A KR100617700B1 (ko) 2003-11-17 2003-11-17 통신 단말기를 위한 3차원 입체음향 재생 장치 및 방법
KR2003081269 2003-11-17

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EP1531609A1 true EP1531609A1 (en) 2005-05-18

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EP04027299A Withdrawn EP1531609A1 (en) 2003-11-17 2004-11-17 Apparatus and method for reproducing three dimensional stereo sound for communication terminal

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US (1) US20050131562A1 (ko)
EP (1) EP1531609A1 (ko)
JP (1) JP2005151572A (ko)
KR (1) KR100617700B1 (ko)
CN (1) CN1625185A (ko)

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KR20050047440A (ko) 2005-05-20
CN1625185A (zh) 2005-06-08
US20050131562A1 (en) 2005-06-16
KR100617700B1 (ko) 2006-08-28
JP2005151572A (ja) 2005-06-09

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